What is hiatus semilunaris?
The hiatus semilunaris is a semicircular shaped opening located on the lateral wall of the nasal cavity. It is a component of the ostiomeatal complex and serves as the opening for the frontal and maxillary sinuses and the anterior ethmoid air cells.
Which sinus drains into the hiatus semilunaris?
maxillary sinus
Hiatus semilunaris receives drainage from the ethmoid bulla. The maxillary sinus and often the frontal sinus, depending on the superior attachment of the uncinate process, drain into the ethmoid infundibulum.
What is the hiatus semilunaris and Infundibulum?
Abstract. The infundibulum is an air-containing space that is bounded by the uncinate process medially, the lamina papyracea laterally and the ethmoidal bulla posteriorly. The hiatus semilunaris is two-dimensional, defining the extreme medial opening of the infundibulum.
What is Infundibulum in nose?
The ethmoid infundibulum is a curved cleft of the ethmoid bone which leads into the anterior portion of the hiatus semilunaris. It is bordered medially by the uncinate process and laterally by the orbital plate of the ethmoid. The anterior ethmoidal cells and maxillary ostia can also open into the infundibulum.
Which of the paranasal sinuses have openings within the hiatus semilunaris?
The hiatus semilunaris (or semilunar hiatus) is a crescent-shaped groove in the lateral wall of the nasal cavity just inferior to the ethmoidal bulla. It is the location of the openings for the frontal sinus, maxillary sinus, and anterior ethmoidal sinus.
What is the function of paranasal sinuses?
They are centered on the nasal cavity and have various functions, including lightening the weight of the head, humidifying and heating inhaled air, increasing the resonance of speech, and serving as a crumple zone to protect vital structures in the event of facial trauma.
What is Infundibulum anatomy?
The infundibulum (Latin: “funnel”) is the funnel-shaped portion of the right ventricle that opens into the pulmonary artery. Its narrowing is also called infundibular stenosis. Pulmonary stenosis is usually a congenital defect and may be associated with other cardiovascular congenital defects.
How maxillary hiatus is reduced?
In the articulated skull this aperture is much reduced in size by the following bones: the uncinate process of the ethmoid above, the ethmoidal process of the inferior nasal concha below, the vertical part of the palatine behind, and a small part of the lacrimal above and in front; the sinus communicates with the …
What is paranasal sinus?
Listen to pronunciation. (PAYR-uh-NAY-zul SY-nus) One of many small hollow spaces in the bones around the nose. Paranasal sinuses are named after the bones that contain them: frontal (the lower forehead), maxillary (cheekbones), ethmoid (beside the upper nose), and sphenoid (behind the nose).
What is a Choana?
Choana: An opening at the back of the nasal passage (there is a left and a right side) that empties into the space behind the nose called the nasopharynx, where the adenoids and eustachian tube are.
What is the function of Choana?
They are considered one of the most important synapomorphies of sarcopterygians, that allowed the passage from water to land. In animals with secondary palates, they allow breathing when the mouth is closed. In tetrapods without secondary palates their function relates primarily to olfaction (sense of smell).
What is the semilunar hiatus?
The semilunar hiatus or hiatus semilunaris, is a crescent-shaped groove in the lateral wall of the nasal cavity just inferior to the ethmoid bulla. It is the location of the openings for maxillary sinus.
What is the sinus fossa?
a deep, narrow groove in the lateral wall of the middle meatus of the nasal cavity, into which the maxillary sinus, the frontonasal duct, and the middle ethmoid cells open. hiatus semilunaris. The groove in the external wall of the middle meatus of the nasal fossa into which the frontal sinus, maxillary sinus, and anterior ethmoid sinuses drain.
What is the lateral wall of the nasal cavity?
Lateral wall of nasal cavity; the three nasal conchæ have been removed. (Third caption from the top.) The semilunar hiatus or hiatus semilunaris, is a crescent-shaped groove in the lateral wall of the nasal cavity just inferior to the ethmoid bulla. It is the location of the openings for maxillary sinus.
What are the openings of the nasal sinus?
It is the location of the openings for the frontal sinus, maxillary sinus, and anterior ethmoidal sinus. It is bounded inferiorly and anteriorly by the sharp concave margin of the uncinate process of the ethmoid bone, superiorly by the ethmoidal bulla, and posteriorly by the ethmoidal process of the inferior nasal concha.